backporting trident

How can I get my custom trident to act like the normal one? I have got it to "work" but it has the chest icon and is broken when I try using the default minecraft textures/mappings as I do not want to attempt to recreate the trident in a model maker, I think its mainly an issue with the model mapping im not sure how I can use the textures that I have added what do I modify in order to be able to use them? this is what the default mapping has in it, also is there any way to be able to disable/hide items, recipes and blocks for certain versions such as 1.15 and 1.14 as tridents exist already in those and I usually just paste all the new stuff into the old ones so I dont have to redo everything for the 2 other versions, I work on 1.14 and port to 1.12 and 1.15

{
    "parent": "builtin/entity",
    "gui_light": "front",
    "textures": {
        "particle": "item/trident"
    },
    "display": {
        "thirdperson_righthand": {
            "rotation": [ 0, 60, 0 ],
            "translation": [ 11, 17, -2 ],
            "scale": [ 1, 1, 1 ]
        },
        "thirdperson_lefthand": {
            "rotation": [ 0, 60, 0 ],
            "translation": [ 3, 17, 12 ],
            "scale": [ 1, 1, 1 ]
        },
        "firstperson_righthand": {
            "rotation": [ 0, -90, 25 ],
            "translation": [ -3, 17, 1],
            "scale": [ 1, 1, 1 ]
        },
        "firstperson_lefthand": {
            "rotation": [ 0, 90, -25 ],
            "translation": [ 13, 17, 1],
            "scale": [ 1, 1, 1 ]
        },
        "gui": {
            "rotation": [ 15, -25, -5 ],
            "translation": [ 2, 3, 0 ],
            "scale": [ 0.65, 0.65, 0.65 ]
        },
        "fixed": {
            "rotation": [ 0, 180, 0 ],
            "translation": [ -2, 4, -5],
            "scale":[ 0.5, 0.5, 0.5]
        },
        "ground": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ 4, 4, 2],
            "scale":[ 0.25, 0.25, 0.25]
        }
    },
    "overrides": [
        {
            "predicate": {
                "throwing": 1
            },
            "model": "item/trident_throwing"
        }
    ]
}